I don't know how I did it, but my phone got set on headphones. I cannot hear anything but the phone ring without headphones. How can i change this back so I can hear phone calls without headphones?
The reason I know it is a headphone setting is that when I change the volume it says ringer in big letters and headphones in little letters. I have never seen the word headphones before and i have never had trouble like this before...
A tiny bit of dust in just the wrong spot inside the headphone jack can make the iPhone think the headphones are plugged in. So plugging and unplugging the headphones a few times usually fixes it.